Gamers taking part in the experience are introduced to a storyline based on Illuminati-style conspiracy theories. Contestants enter the study of a man who has gone missing after delving into claims the world is run by a cabal of shape-shifting intergalactic lizards.

Hidden throughout the study are a complex series of puzzles and clues that point to what has become of him, and how the gamers can escape within their 60 minute slot.

Exit Strategy will also be linked to an interactive app, Reptile Resistance, that explores the storyline in more detail, inviting users to complete brain-teasing challenges to help defeat the lizards running the globe.

The escape game is the work of Jack Crump and his dad John, who have been working in the building since late last year.

Excited for the opening Jack, 19, said: “There are computer game versions where you are stuck in a room but this is a real life one where you need to solve as many puzzles as you can and get out.

"It’s for anyone who reckons they can face up to the challenge - gamers, families, groups on work team building exercises. This is supposed to have an Illuminati-type theme. There are brain teasers, physical activities, hidden objects and hidden rooms - but there are also plenty of red herrings.”

The final touches are now being made to the Exit Strategy - though the Crumps hope to eventually build two more games at the former courthouse.

For more details - and a more in-depth back story - visit the game’s website here or the app’s website here.